I brought a sony CRT TV from the UK to NZ.
Getting it tuned in was easy, just change the audio carrier from I to B/G.
But the Polarity thing is 100% true. The TV engineer who tried to fix mine said it was one of the worst cases he'd seen but it happens.
Colour purity was severly messed up for about 1/3rd of the screen.
You can fix it (supposedly) bu removing the tube and replacing it the other way up. I didnt bother. Just bought a plasma on 2 years intrest free..:D
Its now sat in the garage if anyone wants to verify the truth of it, or even just cart it away..